Definitions

1. noun

a prefix used in scientific and medical terms to denote a relation to the surface of something

“epithelial cells line the surface of the skin”

2. prefix

denoting a relation to the surface of something

“epidermal layer of skin”

3. adjective

relating to or forming the outer layer of an organ or tissue

“epidermal cells are found in the outer layer of the skin”

4. suffix

used in medical terms to denote the outer layer or surface of an organ or tissue

“epiderm- is used in medical terms related to the outer layer of the skin”